Your comments

That's nice when you have few hundert tabs, not if you have few tousands. But it could work in 2 ways, highlighting the duplicates or simply "removing oldest/newest
I'd love to see a button that search for duplicate tabs (or what even often happens for me - duplicate nodes!) and delete the oldest tabs/nodes first, I really like this extension, but I usually don't remember about cleaning up the extension every chrome run, and after some time it piles up which in effect makes me waste A LOT of time on cleaning this up.